Newbie w/New IDirve Infotainment question?!

Hey all, I just took delivery of my new '08 4.8i X5 Sport about 2 weeks ago and am absolutely loving it so far! I have been reading up on the vehicle as much as I can find out and have seen that a new IDrive will be available this fall for the new 7 and then in the spring/summer '09 for the X5. My question is, do you think it would be possbile to upgrade my current IDrive to the new system once released? I realize the controller,screen, and computer will be different, but being that this is my first BMW, I wasn't sure if in the past, BMW made it possible to upgrade to new features as they came out. The system sounds like it will be very nice and I'd like to be able to upgrade to it!(instead of having to buy and new model 4 or 5 years down the road) Any comments or suggestions would be great!!